USA HISTORY

Detailed explanation-1: -When the Transcontinental Railroad was completed in 1869, it accelerated the decimation of the species and by 1900, naturalists estimated less than 1, 000 bison remained. By the late 1880s, the endless herds of bison were wiped out and just a few hundred individuals remained.

Detailed explanation-2: -The decline of the buffalo is largely a nineteenth-century story. The size of the herds was affected by predation (by humans and wolves), disease, fires, climate, competition from horses, the market, and other factors. Fires often swept the grasslands, sometimes maiming and killing buffaloes.

Detailed explanation-3: -Drought is only one reason for the bison’s decline. Horses, which spread from New Mexico onto the Great Plains in the late 1600s and early 1700s, also stressed bison populations. The Comanches, eminent equestrians of the Southern Plains, kept vast herds of horses for riding and trading.

Detailed explanation-4: -Once roaming in vast herds, the species nearly became extinct by a combination of commercial hunting and slaughter in the 19th century and introduction of bovine diseases from domestic cattle. With a population in excess of 60 million in the late 18th century, the species was culled down to just 541 animals by 1889.

Detailed explanation-5: -The destruction of the bison had two important consequences: It left the vast grasslands open to the herds of cattle moving north from Texas. Now cattle ranches appeared in the north. More importantly, though, it robbed the Plains Tribes of the one resource that allowed them to move across the plains.